/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.sql.planner.plan;
import com.facebook.presto.sql.planner.Symbol;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import javax.annotation.concurrent.Immutable;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
@Immutable
public class UnnestNode
extends PlanNode
{
private final PlanNode source;
private final List<Symbol> replicateSymbols;
private final Map<Symbol, List<Symbol>> unnestSymbols;
private final Optional<Symbol> ordinalitySymbol;
@JsonCreator
public UnnestNode(
@JsonProperty("id") PlanNodeId id,
@JsonProperty("source") PlanNode source,
@JsonProperty("replicateSymbols") List<Symbol> replicateSymbols,
@JsonProperty("unnestSymbols") Map<Symbol, List<Symbol>> unnestSymbols,
@JsonProperty("ordinalitySymbol") Optional<Symbol> ordinalitySymbol)
{
super(id);
this.source = requireNonNull(source, "source is null");
this.replicateSymbols = ImmutableList.copyOf(requireNonNull(replicateSymbols, "replicateSymbols is null"));
checkArgument(source.getOutputSymbols().containsAll(replicateSymbols), "Source does not contain all replicateSymbols");
requireNonNull(unnestSymbols, "unnestSymbols is null");
checkArgument(!unnestSymbols.isEmpty(), "unnestSymbols is empty");
ImmutableMap.Builder<Symbol, List<Symbol>> builder = ImmutableMap.builder();
for (Map.Entry<Symbol, List<Symbol>> entry : unnestSymbols.entrySet()) {
builder.put(entry.getKey(), ImmutableList.copyOf(entry.getValue()));
}
this.unnestSymbols = builder.build();
this.ordinalitySymbol = requireNonNull(ordinalitySymbol, "ordinalitySymbol is null");
}
@Override
public List<Symbol> getOutputSymbols()
{
ImmutableList.Builder<Symbol> outputSymbolsBuilder = ImmutableList.<Symbol>builder()
.addAll(replicateSymbols)
.addAll(Iterables.concat(unnestSymbols.values()));
ordinalitySymbol.ifPresent(outputSymbolsBuilder::add);
return outputSymbolsBuilder.build();
}
@JsonProperty
public PlanNode getSource()
{
return source;
}
@JsonProperty
public List<Symbol> getReplicateSymbols()
{
return replicateSymbols;
}
@JsonProperty
public Map<Symbol, List<Symbol>> getUnnestSymbols()
{
return unnestSymbols;
}
@JsonProperty
public Optional<Symbol> getOrdinalitySymbol()
{
return ordinalitySymbol;
}
@Override
public List<PlanNode> getSources()
{
return ImmutableList.of(source);
}
@Override
public <C, R> R accept(PlanVisitor<C, R> visitor, C context)
{
return visitor.visitUnnest(this, context);
}
@Override
public PlanNode replaceChildren(List<PlanNode> newChildren)
{
return new UnnestNode(getId(), Iterables.getOnlyElement(newChildren), replicateSymbols, unnestSymbols, ordinalitySymbol);
}
}